Planar lightwave circuit design for programmable complementary spectral keying encoder and decoder

A planar lightwave circuit design for implementing complementary spectral k eying encoders and decoders is presented. The design uses only one arrayed- waveguide grating integrated with arrays of thermo-optic phase shifters and attenuators in a reflective structure. The result is a compact, low compon ent count, programmable spectral keying switch that can implement a variety of spectral encoding/decoding functions.